Rotary rust or scale cleaner



1,692,500 K. H, V. GUSTAFSSON ROTARY RUST OR SCALE CLEANER i Nov. 2o,1928.A A

Filed April 18, 1927 A l :mlm/111110,n.vlllllllffllllllrlulnvill/111111111111111r11/11111111111111111111.1111111 IN VEN TOR.

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vPatented Nov. 20,v 1928.

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KNUT HARALD VILHELMA 'GUsTAFssoN-,lor ao'r'rnixm"one,1swEDEN;u;v i

ROTARY RUsr` 0R SCALE CLEANER. j

Application filed April 18, 1927, Serial No. 184,744,A and `in SwedenMarch 22, 1927.

This invention refers to rotary tools for removing of rust orscale frommetal surfaces. p

rlhe present invention has for its object to improve tools of this typeand for that purpose the tool is built eccentrical andnoncounterweighed, the result being that the tool when rotated speedilyis brought into a violent shaking movement,which within the narrow spaceof a water tube boiler pipe` causes the blows which are necessary toloosen and remove the scale. To attain such a result the tool consistsprincipally of a chipping member eccentrically suspended at the free endof a long and thin steel shaft of a suitable elasticity and rigidlyclamped at the other end. Said thin shaft with the chipping member is inany known manner caused to rotate rapidly about the centre line of theclamped end, and the chipping' member is thus caused to strike theuneven surface of the scale which is always more or less present on thesurface of the tubes thereby producing such` blows which are necessaryfor the removing of the scale.

In theaccompanying drawing tWo embodiments of the invention areillustrated,`in whichz- Figure 1 is a longitudinal section through aportion of a water tube with the tool in operative position,

Figure 2 is a cross section of the water tube on a larger scale with oneembodiment of the chipping member, and v Figure 8 a similar view ofanother embodiment of the chipping member proper.

lVith referenceto the embodiments illustrated in the drawing the rustorscale-removing tool comprises a thick guiding shaft 1 which by means ofa coupling 2 of any known kind is connected with for instance a flexibleshaft 3 rotated by an electric motor not shown in the drawing, or in anyother suitable way. The guiding shaft 1 which may be of a comparativelyshort ylength and a large Ydiameter, is carried at its ends 4, 5 byballor roller-bearings 6, the outer race rings vof which rest againstthe interior wall of the tube to be cleaned. In the guiding shaft 1there is rigidly and centrally clamped` a thin steel shaft 8, which isof a comparatively long length and projects from' the inner end 5 of theguiding shaft 1. Atthe free vend 9 of the thin shaft 8 a chippingv Saidchipping member can beivariously vdesigned, and the Figures 2 and 3 showonly as examples two suit-able embodiments, ac-

cording to which the chipping member is the tube, while the eccentricalarrangement of the chippingmember 10 at the free end of the long andthinv steel shaft 8 `causes said chipping member during its rotation tostrike against the uneven coating 11 in the tube. On account of theelasticity of the thin steel shaft 8'the shocks react upon the chippingmember and sit up and maintain -a vibratory or hammering actionV againstthe inner tube surface thereby knocking oif the scale. Duringtheoperation the toolY is pushed forward within the tube, and on accountof the bearings 6 for the shaft 1 the vibratory movement ofthe shaft 8is arrested and the workman suffers but slightly from the violent shocksof the tool. Y

, Though I have shown in the drawing and hereabove referred to thebearings 6 and theV thick shaft 1 as means for holding the thin shaft 8c'entrally within the tube, so that the clamped end of the shaft 8 isykept in aligni ment kwith the flexible shaft 3, I do notk want to limitmyself exclusively to such means for the'samel purpose. The essentialfeature of said centering means is to keep the inner end of the shaft 8rigidly in alignment with of which the means illustrated are chosenmerely as an example. For instance the inner end of the shaft 8 can` beheld in the handsof the operator.

Having lthus particularly described and ascertainedfthe nature of mysaid invention and in what manner the same is to be performed, I declarethat what I claim is n 1. A rotary rust or scale cleaner for internalcleaning of boiler and like tubes in-` cluding a rotatable shaft, achipping member eccentrically mounted at the 'free end of said shaft,guide means for said shaft located at a substantial distance from thechipping member whereby the axis of the journalled portion of said shaftis held in posivthe power transmitting shaft 3, and that can lbe-performed in rather innumerable ways'V tion in the centre of the tubeunder treat-` ment toprevent displacement across theinteriorofthe tube.

2. A rotary rust or scale cleaner Hes 5 claimed in elam 1,.eharaeterizedltherein Y that said haft carrying the chipping member is madeA ofsmallksecton steel 'having f Signatura KNUT'; HARALD VILHELM GUSTAFSSON.

